Gate jacking mechanism

By setting a gate clamping mechanism on the limit frame of the lifting gate and adjusting the gate plate by using the abutting wheel and the adjusting mechanism, the problem of inconvenient maintenance of water leakage points of the lifting gate is solved, and the water leakage points are accurately sealed and maintenance is simplified.

CN223867191UActive Publication Date: 2026-02-03HEBEI ZHUHONG WATER CONSERVANCY MACHINERY CO LTD
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Patent Information

Application Number
CN202520467146.0
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2025-03-18
Publication Date
2026-02-03
Estimated Expiration
2035-03-18

AI Technical Summary

Technical Problem

Existing lifting gates are prone to leaks after a period of use, making maintenance inconvenient and difficult to fix in place, thus increasing the difficulty of maintenance.

Method used

The gate clamping mechanism includes a contacting component and an adjusting mechanism. The contacting wheel contacts the gate plate, and the position of the contacting component is adjusted by tightening bolts and balancing bolts to achieve precise contact with the gate plate and seal the leakage point.

Benefits of technology

No replacement of parts or the lifting gate body is required. Multiple adjustments can effectively seal the leaks, simplifying the maintenance process, reducing maintenance difficulty, and making it easy to adjust underwater.

✦ Generated by Eureka AI based on patent content.

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Abstract

The utility model discloses a gate jacking mechanism which is arranged on a limiting frame of a lifting gate and comprises an abutting piece arranged in the limiting frame, the abutting piece is used for being connected with an intercepting face of a gate plate in the lifting gate, and an adjusting mechanism used for enabling the abutting piece to move towards the gate plate is arranged on the limiting frame. The adjusting mechanism is adopted for adjusting the abutting degree of the abutting piece to the gate plate, then the water leakage point can be sealed in a targeted mode, accessories and the lifting gate body do not need to be replaced, adjustment can be conducted many times, sealing of the water leakage point can be completed without professionals, and the sealing efficiency is improved. The problem that an existing lifting gate is inconvenient to maintain after a front water leakage point appears is effectively solved.
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Description

TECHNICAL FIELD

[0001] The utility model belongs to the field of water conservancy machinery, in particular to a gate pressing mechanism. BACKGROUND

[0002] In the process of sewage treatment in sewage treatment plant, the lifting gate (also known as cast iron gate) is generally used for interception between each process and pool. When the lifting gate is closed, the inclined convex on the limiting frame on both sides of the gate cooperates with the inclined concave on the gate to make the water stopper on the limiting frame tightly contact with the gate, thereby avoiding water leakage.

[0003] However, after a period of use, the water stopper is damaged or the inclined convex and the inclined concave do not cooperate closely, resulting in water leakage after the gate is closed. At this time, the entire gate or the water stopper needs to be replaced according to the specific situation, which is inconvenient to maintain and the position of the water leakage point is not fixed, increasing the difficulty of maintenance. UTILITY MODEL CONTENTS

[0004] The utility model solves the technical problem of providing a gate pressing mechanism to solve the problem of inconvenient maintenance of the current lifting gate after the front water leakage point occurs.

[0005] To solve the above problems, the utility model adopts the following technical scheme:

[0006] A gate pressing mechanism is arranged on the limiting frame of the lifting gate and includes an abutting piece arranged in the limiting frame. The abutting piece is used to abut with the interception surface of the gate plate in the lifting gate. An adjusting mechanism is arranged on the limiting frame to move the abutting piece towards the gate plate.

[0007] Further, the abutting piece is an abutting wheel. The outer periphery of the abutting wheel abuts with the gate plate in the lifting gate. The rotating shaft of the abutting wheel is parallel to and horizontally arranged on the interception surface of the gate plate. The adjusting mechanism is used to move the abutting wheel towards the gate plate.

[0008] Further, a flexible ring is sleeved on the outer periphery of the abutting wheel.

[0009] Further, the adjusting mechanism includes a pressing bolt and a balance bolt. The pressing bolt is screw-connected to the limiting frame and is perpendicular to the interception surface of the gate plate. One end of the balance bolt is fixedly connected to the rotating shaft of the abutting wheel. The other end of the balance bolt is slidingly connected to the limiting frame. The balance bolt is coaxial with the abutting wheel. The end of the pressing bolt abuts with the outside of the balance bolt.

[0010] Further, a first locking nut is screw-connected to the pressing bolt. The other end of the balance bolt extends out of the limiting frame. A second locking nut is screw-connected to the other end of the balance bolt. The first locking nut and the second locking nut are both located outside the limiting frame.

[0011] Further, the tooth ring is arranged outside the screw cap of the tightening bolt and the third locking nut, and the third limiting plate is arranged outside the tightening bolt of the limiting frame.

[0012] Further, the tooth ring is arranged outside the screw cap of the tightening bolt and the third locking nut, and the third limiting plate is arranged outside the tightening bolt of the limiting frame.

[0013] Further, the rotating shaft of the abutting wheel is fixedly connected to the inner side of the U-shaped frame, the U-shaped frame is slidingly connected to the limiting frame, and the sliding direction of the U-shaped frame is towards the intercepting surface of the gate plate.

[0014] Further, the adjusting mechanism comprises a tightening bolt which is screw-connected to the limiting frame and is used for pushing the U-shaped frame towards the gate plate, and the third locking nut which is screw-connected to the tightening bolt and is located outside the limiting frame.

[0015] Further, the tooth ring is arranged outside the screw cap of the tightening bolt and the third locking nut, and the third limiting plate is arranged outside the tightening bolt of the limiting frame.

[0016] The utility model discloses obtained the remarkable beneficial effect:

[0017] 1. The application adopts the adjusting mechanism to adjust the abutting degree of the abutting piece to the gate plate, and then the water leakage point can be sealed in a targeted manner, and the spare parts and the lifting gate body do not need to be replaced, and the water leakage point can be sealed without professional personnel, and the problem that the lifting gate is inconvenient to maintain after the water leakage point appears is solved.

[0018] 2. The tooth bar and the tooth ring can be adjusted conveniently when there is water.

[0019] 3. The first limiting plate, the second limiting plate and the third limiting plate can limit the position of the tooth bar, and the tooth bar and the tooth ring can be engaged conveniently.

[0020] 4. The limiting groove on the first limiting plate, the second limiting plate and the third limiting plate can conveniently find the position of the corresponding tooth ring, and the tooth bar and the tooth ring can be engaged conveniently. BRIEF DESCRIPTION OF DRAWINGS

[0021] ATTACH Figure 1 It is a first top view sectional structure schematic diagram of the application example 1 in use state.

[0022] ATTACH Figure 2The utility model discloses an embodiment 1 uses state left view structure schematic diagram for the utility model embodiment 1 uses state left view structure schematic diagram.

[0023] The utility model discloses an embodiment 1 uses state left view structure schematic diagram for the utility model embodiment 1 uses state left view structure schematic diagram. Figure 3 The utility model discloses an embodiment 1 uses state left view structure schematic diagram for the utility model embodiment 1 uses state left view structure schematic diagram.

[0024] The utility model discloses an embodiment 1 uses state left view structure schematic diagram for the utility model embodiment 1 uses state left view structure schematic diagram. Figure 4 The utility model discloses an embodiment 1 uses state left view structure schematic diagram for the utility model embodiment 1 uses state left view structure schematic diagram.

[0025] The utility model discloses an embodiment 1 uses state left view structure schematic diagram for the utility model embodiment 1 uses state left view structure schematic diagram. Figure 5 The utility model discloses an embodiment 1 uses state left view structure schematic diagram for the utility model embodiment 1 uses state left view structure schematic diagram.

[0026] The utility model discloses an embodiment 1 uses state left view structure schematic diagram for the utility model embodiment 1 uses state left view structure schematic diagram. Figure 6 The utility model discloses an embodiment 1 uses state left view structure schematic diagram for the utility model embodiment 1 uses state left view structure schematic diagram.

[0027] The utility model discloses an embodiment 1 uses state left view structure schematic diagram for the utility model embodiment 1 uses state left view structure schematic diagram. Figure 7 The utility model discloses an embodiment 1 uses state left view structure schematic diagram for the utility model embodiment 1 uses state left view structure schematic diagram.

[0028] The utility model discloses an embodiment 1 uses state left view structure schematic diagram for the utility model embodiment 1 uses state left view structure schematic diagram. Figure 8 The utility model discloses an embodiment 1 uses state left view structure schematic diagram for the utility model embodiment 1 uses state left view structure schematic diagram.

[0029] The utility model discloses an embodiment 1 uses state left view structure schematic diagram for the utility model embodiment 1 uses state left view structure schematic diagram. Figure 9 The utility model discloses an embodiment 1 uses state left view structure schematic diagram for the utility model embodiment 1 uses state left view structure schematic diagram.

[0030] In the drawing, 1, gate; 2, abutment wheel; 3, pivot; 4, flexible ring; 5, tight bolt; 6, balance bolt; 7, limit frame; 8, first locking nut; 9, second locking nut; 10, gear ring; 11, rack; 12, hand handle; 13, first limit plate; 14, second limit plate; 15, U-shaped frame; 16, third locking nut; 17, third limit plate; 18, sliding slot; 19, sliding block; 20, long slot; 21, recess; 22, slide rail; 23, limit slot; 24, water stop. Specific implementation

[0031] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. The following description of at least one exemplary embodiment is actually only illustrative, rather than any limitation on the present application and its application or use. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of the present application.

[0032] It should be noted that the lifting gate comprises a lifting frame, limiting frames 7 arranged on both sides of the lifting frame, a gate plate 1 slidingly connected between the two limiting frames 7, and a lead screw lifting machine arranged at the upper end of the lifting frame, the lead screw lifting machine being used to drive the gate plate 1 to lift, and the front side of each of the two limiting frames 7 is provided with a water stop strip 24 matched with the intercepting surface of the gate plate 1;

[0033] The lifting gate is a prior art, and only the cooperation of the gate plate and the limiting frame is shown in the drawing related to the embodiment, and the overall schematic view of the lifting gate is not shown;

[0034] The intercepting surface of the gate plate refers to the two surfaces with the largest water contact area of the gate plate;

[0035] The front side of the limiting frame mentioned above is the upper side in the drawing, and the orientation of the gate plate is described according to the orientation of the limiting frame. Embodiment one

[0036] As shown in Figures 1-5 A gate clamping mechanism is installed in the limiting frame 7 of the lifting gate, and the number of gate clamping mechanisms is at least one. When the number of gate clamping mechanisms is more than one, the gate clamping mechanisms are evenly distributed in the two limiting frames 7 and are installed in sequence along the height direction of the limiting frame 7.

[0037] The gate clamping mechanism in this embodiment comprises an abutting member installed in the limiting frame 7, the abutting member is used to abut against the intercepting surface of the gate plate 1 in the lifting gate, the abutting member is located on the side of the gate plate 1 away from the water stop strip 24, and the limiting frame 7 is provided with an adjusting mechanism for moving the abutting member towards the gate plate 1.

[0038] Specifically, the abutting member is an abutting wheel 2, the outer circumferential surface of the abutting wheel 2 is in contact with the gate plate 1 in the lifting gate, the rotating shaft 3 of the abutting wheel 2 is parallel to and horizontally arranged on the lower intercepting surface of the gate plate 1, and the adjusting mechanism is used to move the abutting wheel 2 towards the gate plate 1; the abutting wheel 2 is rotationally connected to the rotating shaft 3.

[0039] The adjusting mechanism comprises a clamping bolt 5 screw-connected to the lower side of the limiting frame 7 and a balance bolt 6 slidingly connected to the side surface of the limiting frame 7, the clamping bolt 5 is perpendicular to the intercepting surface of the gate plate 1, one end of the balance bolt 6 is fixedly connected to the rotating shaft 3 of the abutting wheel 2, the other end of the balance bolt 6 is slidingly connected to the side surface of the limiting frame 7, the balance bolt 6 is coaxial with the abutting wheel 2, and the end portion of the clamping bolt 5 located in the limiting frame 7 abuts against the outside of the balance bolt 6.

[0040] In order to prevent the jacking bolt 5 and the balance bolt 6 from moving again after moving, a first locking nut 8 is threadedly connected to the jacking bolt 5, the balance bolt 6 extends out of the limiting frame 7, a second locking nut 9 is threadedly connected to the other end of the balance bolt 6, and the first locking nut 8 and the second locking nut 9 are located outside the limiting frame 7. By rotating the first locking nut 8 after rotating the jacking bolt 5, the first locking nut 8 is abutted against the limiting frame 7, thereby relatively fixing the position of the jacking bolt 5. Similarly, after the balance bolt 6 is pushed by the jacking bolt 5 towards the gate 1, the second locking nut 9 is screwed to abut against the limiting frame 7, thereby fixing the position of the balance bolt 6.

[0041] It should be noted that, as known to those skilled in the art, the application implicitly discloses that a sliding groove 18 is provided on the side of the limiting frame 7 for the balance bolt 6 to move towards the gate 1. In order to increase the stability of the balance bolt 6 during movement, a sliding block 19 is provided on the part of the balance bolt 6 located in the sliding groove 18, and a long groove 20 is provided in the sliding groove 18 corresponding to the sliding block 19. In order to facilitate the jacking bolt 5 to push the balance bolt 6, a recess 21 is provided on the balance bolt 6 corresponding to the position of the jacking bolt 5, and the end of the jacking bolt 5 is located in the recess 21.

[0042] In order to avoid the lifting of the gate 1 causing large wear to the abutting wheel 2, a flexible ring 4 is sleeved on the outer periphery of the abutting wheel 2. The flexible ring 4 is made of rubber. When the gate 1 enters the gap between the abutting ring and the inner side of the limiting frame 7, the flexible ring 4 deforms to avoid the influence of the gate 1 on the abutting ring.

[0043] The working principle is that first, a plurality of gate jacking mechanisms are uniformly installed in the two limiting frames 7. When a water leakage point occurs, the water leakage point or the gate jacking mechanism closest to the water leakage point is adjusted to seal the water leakage point. Specifically, the second locking nut 9 is loosened to lock the balance bolt 6, and then the first locking nut 8 is loosened to lock the jacking bolt 5. The jacking bolt 5 is screwed into the limiting frame 7 to push the balance bolt 6 towards the gate 1. During the movement of the balance bolt 6, the abutting wheel 2 is driven to increase the abutting force on the gate 1, thereby making the gate and the water stop strip tightly contact, and sealing the water leakage point.

[0044] In combination with the above, the application uses an adjusting mechanism to adjust the abutting degree of the abutting member to the gate 1, thereby sealing the water leakage point, without the need to replace the parts and lift the gate body, and the water leakage point can be sealed multiple times without the need for professional personnel, effectively solving the problem of inconvenient maintenance of the current lifting gate after the front water leakage point occurs. Embodiment Two

[0045] As Figure 6 and Figure 7As shown, the structure of the embodiment is basically the same as that of example 1, and the embodiment is further optimized on the basis of example 1. When water is on the side of the limiting frame 7 where the jacking bolt 5 is located, it is inconvenient to adjust the jacking bolt 5 at this time. Therefore, in the embodiment, a gear ring 10 is fixedly arranged outside the nut of the jacking bolt 5 and outside the first locking nut 8. A first limiting plate 13 is fixedly connected outside the limiting frame 7 and on the side of the nut of the jacking bolt 5. At this time, the first limiting plate 13 is also located on the side of the first locking nut 8. A gear rack 11 is detachably connected between the nut of the jacking bolt 5 and the first limiting plate 13. By detaching the gear rack 11, the gear rack 11 can be engaged with the gear ring 10 outside the nut of the jacking bolt 5 or the gear ring 10 outside the first locking nut 8. A hand handle 12 is fixedly connected to the upper end of the gear rack 11.

[0046] In order to facilitate the adjustment of the second locking nut 9, a gear ring 10 is also fixedly arranged outside the second locking nut 9. A second limiting plate 14 is also arranged outside the limiting frame 7 and on the side of the second locking nut 9. A gap adapted to the gear rack 11 is arranged between the second limiting plate 14 and the second locking nut 9.

[0047] The gear rack 11 can be engaged with the gear ring 10 on the jacking bolt 5, the gear ring 10 of the first locking nut 8, or the gear ring 10 on the second locking nut 9.

[0048] The position of the gear rack 11 can be moved by the hand handle 12 to adjust the second locking nut 9, the first locking nut 8, or the jacking bolt 5. The first limiting plate 13 and the second limiting plate 14 can limit the movement of the gear rack 11, facilitating the adjustment of the second locking nut 9, the first locking nut 8, or the jacking bolt 5.

[0049] It should be noted that, in normal times, the gear rack 11 can be temporarily placed between the limiting plate and the gear ring 10 of the second locking nut 9, and removed when adjustment is needed. The thickness of the hand handle 12 is less than the thickness of the gear rack 11, so as to facilitate the placement of the hand handle 12 between the limiting plate and the jacking bolt 5 or between the second limiting plate 14 and the second locking nut 9.

[0050] The working principle is that when the gate top pressing mechanism is multiple, the first limiting plate 13 and the second limiting plate 14 are long strips and are vertically installed, when adjustment is needed, the rack 11 is moved by the hand-held handle 12 to make it enter between two adjacent top pressing bolts 5 in the height direction or between two second locking nuts 9 or between two first locking nuts 8 from the outside of the first limiting plate 13 or the second limiting plate 14, by moving the rack 11 upwards or downwards, the rack 11 can be engaged with the gear ring 10 on the top pressing bolt 5, the first locking nut 8 or the second locking nut 9 and is rotated, thereby achieving the purpose of loosening the first locking nut 8 or the second locking nut 9, tightening the top pressing bolt 5 and locking the top pressing bolt 5 or the balance bolt 6, and moving the abutting wheel 2 towards the gate plate 1 to seal the water leakage point at the corresponding position.

[0051] It should be noted that the first limiting plate 13 is provided with a limiting groove 23 corresponding to the end cap of the top pressing bolt 5 and the first locking nut 8, and the second limiting plate 14 is provided with a limiting groove 23 corresponding to the second locking nut 9, so as to facilitate the adjustment personnel to move the rack 11 to the corresponding position by holding the hand-held handle 12. Embodiment three

[0052] As shown in Figure 8 and Figure 9 , the structure of the present embodiment is substantially the same as that of embodiment 1, and the difference between the present embodiment and embodiment 1 is that, as another implementation, the both ends of the rotating shaft 3 of the abutting wheel 2 are fixedly connected in the U-shaped frame 15, the abutting wheel 2 is rotatably connected on the rotating shaft 3, the U-shaped frame 15 is slidably connected in the limiting frame 7, and the sliding direction of the U-shaped frame 15 is towards the intercepting surface of the gate plate 1.

[0053] The limiting frame 7 is provided with two slide rails 22 perpendicular to the intercepting surface of the gate plate 1 on both sides of the U-shaped frame 15, and the U-shaped frame 15 is slidably connected between the two slide rails 22.

[0054] The adjusting mechanism in the present embodiment includes a top pressing bolt 5 threadedly connected on the limiting frame 7, and the top pressing bolt 5 is used to press the U-shaped frame 15 towards the gate plate 1, and the end of the top pressing bolt 5 located in the limiting frame 7 is located between the two slide rails 22.

[0055] A third locking nut 16 is threadedly connected on the top pressing bolt 5, and the third locking nut 16 is located outside the limiting frame 7, and the top pressing bolt 5 is positioned by rotating the third locking nut 16 to abut against the outside of the limiting frame 7.

[0056] In this embodiment, a toothed ring 10 is fixedly provided on the outer side of the nut of the tightening bolt 5 and the outer side of the third locking nut 16. A third limiting plate 17 is fixedly connected to the outside of the limiting frame 7 on one side of the tightening bolt 5. At this time, the third limiting plate 17 is also located on one side of the third locking nut 16. A rack 11 is detachably connected between the nut of the tightening bolt 5 and the third limiting plate 17. A hand handle 12 is fixedly connected to the upper end of the rack 11. The rack 11 can mesh with the toothed ring 10 on the outer side of the nut of the tightening bolt 5 or the toothed ring 10 on the outer side of the third locking nut 16. By moving the position of the rack 11 through the hand handle 12, it can mesh with the toothed ring 10 on the outer side of the nut of the tightening bolt 5 or the toothed ring 10 on the outer side of the third locking nut 16 respectively.

[0057] Working principle: When there are multiple gate tightening mechanisms, the third limiting plate 17 is a long strip and installed vertically. When adjustment is required, the rack 11 is moved by the hand handle 12 so that it enters from the outside of the third limiting plate 17 between two adjacent tightening bolts 5 or two third locking nuts 16 in the height direction. By moving the rack 11 up or down, the rack 11 can mesh with the gear ring 10 on the tightening bolt 5 or the third locking nut 16 and make the gear ring 10 rotate, thereby completing the purpose of loosening the third locking nut 16, tightening the tightening bolt 5 and locking the tightening bolt 5, so that the position of the abutment wheel 2 moves toward the gate plate 1 and seals the leakage point at the corresponding position.

[0058] It should be noted that the third limiting plate 17 is provided with a limiting groove 23 corresponding to the third locking nut 16, so as to facilitate the adjustment personnel to move the rack 11 to the corresponding position by holding the handle 12.

Claims

1. A gate clamping mechanism, disposed on the limiting frame (7) of a lifting gate, characterized in that: It includes an abutment disposed within the limiting frame (7), the abutment being used to contact the intercepting surface of the gate plate (1) in the lifting gate, and the limiting frame (7) is provided with an adjustment mechanism for moving the abutment toward the gate plate (1).

2. The gate clamping mechanism according to claim 1, characterized in that: The abutting member is an abutting wheel (2). The outer peripheral surface of the abutting wheel (2) is connected to the gate plate (1) in the lifting gate. The rotating shaft (3) of the abutting wheel (2) is parallel to and horizontally set with the interception surface of the gate plate (1). The adjusting mechanism is used to move the abutting wheel (2) toward the gate plate (1).

3. The gate clamping mechanism according to claim 2, characterized in that: The outer circumferential surface of the abutting wheel (2) is fitted with a flexible ring (4).

4. A gate clamping mechanism according to claim 2, characterized in that: The adjustment mechanism includes a tightening bolt (5) threaded onto the limit frame (7) and a balance bolt (6) slidably connected onto the limit frame (7). The tightening bolt (5) is perpendicular to the intercepting surface of the gate (1). One end of the balance bolt (6) is fixedly connected to the rotating shaft (3) of the abutment wheel (2). The other end of the balance bolt (6) is slidably connected onto the limit frame (7). The balance bolt (6) is coaxial with the abutment wheel (2). The end of the tightening bolt (5) abuts against the outside of the balance bolt (6).

5. A gate clamping mechanism according to claim 4, characterized in that: The tightening bolt (5) is threaded with a first locking nut (8), the other end of the balance bolt (6) extends outside the limit frame (7), and the other end of the balance bolt (6) is threaded with a second locking nut (9). The first locking nut (8) and the second locking nut (9) are both located outside the limit frame (7).

6. A gate clamping mechanism according to claim 5, characterized in that: A toothed ring (10) is provided on the outside of the nut of the tightening bolt (5) and the outside of the first locking nut (8). A first limiting plate (13) is provided on the outside of the limiting frame (7) on the side of the nut of the tightening bolt (5). A rack (11) is provided between the first limiting plate (13) and the nut of the tightening bolt (5). The rack (11) meshes with the toothed ring (10) outside the nut of the tightening bolt (5). A hand handle (12) is provided at the upper end of the rack (11).

7. A gate clamping mechanism according to claim 6, characterized in that: A toothed ring (10) is provided on the outer side of the second locking nut (9), and a second limiting plate (14) is provided on one side of the second locking nut (9) outside the limiting frame (7). A gap is provided between the second limiting plate (14) and the second locking nut (9) to match the rack (11).

8. A gate clamping mechanism according to claim 2, characterized in that: The two ends of the shaft (3) of the abutment wheel (2) are fixedly connected to the inside of the U-shaped frame (15). The U-shaped frame (15) is slidably connected inside the limiting frame (7). The sliding direction of the U-shaped frame (15) is towards the intercepting surface of the gate (1).

9. A gate clamping mechanism according to claim 8, characterized in that: The adjusting mechanism includes a tightening bolt (5) threaded onto the limiting frame (7), the tightening bolt (5) being used to push the U-shaped frame (15) toward the gate (1), and a third locking nut (16) threaded onto the tightening bolt (5) located outside the limiting frame (7).

10. A gate clamping mechanism according to claim 9, characterized in that: A toothed ring (10) is provided on the outer side of the nut of the tightening bolt (5) and the outer side of the third locking nut (16). A third limiting plate (17) is provided on one side of the tightening bolt (5) outside the limiting frame (7). A rack (11) is provided between the nut of the tightening bolt (5) and the third limiting plate (17). The rack (11) meshes with the toothed ring (10) outside the nut of the tightening bolt (5). A hand handle (12) is provided at the upper end of the rack (11).